Hirofumi Hamamoto

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Tokyo, JP

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Patents Grantslast 30 patents

Information Patent Grant
Applicator having cap which pressurizes inner space
- Patent number 5,362,169
- Issue date Nov 8, 1994
- Sailor Pen Co., Ltd.
- Hirofumi Hamamoto
- B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES
Information Patent Grant
Method for producing a nondirectional pen
- Patent number 4,547,946
- Issue date Oct 22, 1985
- The Sailor Pen Co., Ltd.
- Kazuhiko Osaki
- B43 - WRITING OR DRAWING IMPLEMENTS BUREAU ACCESSORIES